KR102491062B1 - Semi-incombustible polyurethane board and its manufacturing method. - Google Patents

Abstract

The present invention relates to a semi-incombustible polyurethane board and a method for manufacturing the same, and specifically, has excellent flame retardancy and heat insulation, can significantly reduce the generation of harmful gases in the event of a fire, and is lightweight, easy to install, and has high strength. To provide a semi-incombustible polyurethane board with excellent durability and a manufacturing method thereof.

Description

Semi-incombustible polyurethane board and manufacturing method thereof. {Semi-incombustible polyurethane board and its manufacturing method.}

The present invention relates to a semi-incombustible polyurethane board and a manufacturing method thereof.

In general, a polyurethane board refers to a product in which a polyol and an isocyanate component react to cause a urethane reaction, and a foaming agent is used to inflate a urethane bond to form fine bubbles. Polyurethane board is made by processing foamed urethane and has good workability and very light characteristics.

Polyurethane boards have numerous micropores inside them, so they have excellent insulation properties, and can effectively block noise or conversations coming from the outside, so they are used as optimal building insulation materials and noise prevention materials.

Today, expanded polystyrene boards, polyurethane foam boards, and phenolic foam boards are used as insulation materials for buildings.

Expanded polystyrene boards are relatively light, inexpensive, and have good flame retardancy, but when exposed to fire, they easily burn out, so there are certain limitations in using them as high-quality insulation materials.

In contrast, the urethane foam board has a relatively strong fire resistance and excellent flame retardancy, which is higher than that of the expanded polystyrene, but has a slightly lower level of flame retardancy than that of the phenolic foam board.

On the other hand, in the case of phenolic foam board, although it has been evaluated as having the best flame retardancy, since the phenolic component has a detrimental effect on the human body, it has been evaluated as not suitable for use as a heat insulating material for buildings.

As a result, even if today's phenolic foam board is the most flame retardant, it has a disadvantage that it is not suitable as a heat insulating material for buildings due to its harmfulness to the human body, so its utilization is low.

Therefore, while using a polyurethane board, efforts to develop flame retardant products with improved flame retardancy compared to phenolic foam boards are continuously being made.

Therefore, in a building, a fireproof layer containing fireproof material is constructed to secure fire resistance and insulation at the same time. In general, concrete slabs, PC blocks, deck slabs and locking ribs, embossment or dove tail Forming a urethane foam layer as a flame retardant layer on the surface of a substrate such as a composite deck plate having an insert-type cross-sectional shape such as the back, and mineral wool, glass wool, inorganic refractory components such as carbonates and borates on the surface of the urethane foam layer Forms a composite refractory layer containing

However, the composite refractory layer containing the inorganic refractory component as described above has poor insulation effect due to moisture aggregation and sagging, and the urethane foam layer and the refractory layer formed on the surface of the concrete substrate have unstable interfacial adhesion after construction. Problems such as delamination and poor weather resistance occurred, and thus it was difficult to properly exhibit fire resistance and heat insulation performance.

to address these issues. Korean Patent Registration No. 10-1811225 discloses a polyurethane board having improved incombustibility by attaching a finishing material containing expanded graphite to polyurethane foam, and Korean Patent Registration No. 10-1850997 discloses a polyurethane board having semi-incombustibility through the inclusion of a flame retardant. Although a urethane board has been disclosed, the quasi-incombustible performance judged by a gas toxicity test is still not satisfactory, and a complicated manufacturing process has occurred and improvement is required.

Korean Registered Patent No. 10-1811225 (2017.12.15) Korean Registered Patent No. 10-1850997 (2018.04.16)

An object of the present invention is a semi-incombustible polyurethane board having excellent flame retardancy and heat insulation, significantly reducing the generation of harmful gases in the event of a fire, and at the same time being lightweight, easy to install a heat insulating material, excellent in strength, and excellent in durability, and It is to provide a manufacturing method thereof.

In order to achieve the above object, the present invention is a semi-incombustible polyurethane board comprising a polyurethane foam layer and a surface layer laminated on one or both sides of the polyurethane foam layer, wherein the surface layer includes a heat insulating material layer, a glass fiber layer, and a metal thin film layer, The insulating material layer provides a semi-incombustible polyurethane board obtained by coating and curing a mixture containing a coating agent, water glass, expanded graphite, white lead and silica.

In one embodiment of the present invention, the mixed solution may further include a binder.

In one embodiment of the present invention, the mixed solution is based on 100 parts by weight of the coating agent, 10 to 20 parts by weight of water glass, 10 to 30 parts by weight of expanded graphite, 10 to 30 parts by weight of white lead, 10 to 20 parts by weight of silica, and a binder It may contain 1 to 10 parts by weight.

In one embodiment of the present invention, the thickness of the glass fiber layer may be 0.1 to 5mm.

In one embodiment of the present invention, the metal thin film layer may be an aluminum foil layer.

In one embodiment of the present invention, the polyurethane foam layer may be formed by including polyester polyol, isocyanate, a blowing agent and a catalyst.

In one embodiment of the present invention, the polyurethane foam layer may be formed by further including a flame retardant and a surfactant.

In one embodiment of the present invention, the polyester polyol may be a terephthalic acid-based polyol.

In one embodiment of the present invention, the polyurethane foam layer contains 150 to 300 parts by weight of isocyanate, 30 to 40 parts by weight of a foaming agent, 1 to 10 parts by weight of a catalyst, 10 to 30 parts by weight of a flame retardant, and 1 to 5 parts by weight of a surfactant may be included.

In addition, the present invention comprises the steps of applying the raw material introduced from the first roller on the first conveyor belt to form a lower surface layer, and applying the raw material introduced from the second roller on the second conveyor belt to form an upper surface layer; coating a polyurethane foam raw material between the upper surface layer and the lower surface layer by spraying; and forming a polyurethane foam layer by aging and curing the polyurethane foam raw material in a double conveyor room. A method for manufacturing a semi-incombustible polyurethane board comprising a, wherein the surface layer includes a heat insulating material layer, a glass fiber layer and a metal thin film layer, and the heat insulating material layer is coated with a mixture containing water glass, expanded graphite, white lead, silica and a binder. It provides a method for producing a semi-incombustible polyurethane board.

In one embodiment of the present invention, the thickness of the glass fiber layer may be 0.1 to 5mm.

In one embodiment of the present invention, the metal thin film layer may be an aluminum foil layer.

In one embodiment of the present invention, the polyurethane foam layer may be formed by including polyester polyol, isocyanate, a blowing agent and a catalyst.

In one embodiment of the present invention, the polyurethane foam layer may be formed by further including a flame retardant and a surfactant.

In one embodiment of the present invention, the polyester polyol may be a terephthalic acid-based polyol.

In one embodiment of the present invention, the polyurethane foam layer contains 150 to 300 parts by weight of isocyanate, 30 to 40 parts by weight of a foaming agent, 1 to 10 parts by weight of a catalyst, 10 to 30 parts by weight of a flame retardant, and It may be formed by including 1 to 5 parts by weight of a surfactant.

The present invention provides a semi-incombustible polyurethane board and a method for manufacturing the same, wherein the semi-incombustible polyurethane board has excellent flame retardancy and heat insulation, can significantly reduce the generation of harmful gases in the event of a fire, and is lightweight, It is easy to install, has excellent strength, and has excellent durability.

In addition, the manufacturing method of the semi-incombustible polyurethane board according to the present invention has an effect of significantly improving the productivity of the semi-incombustible polyurethane board having excellent physical properties.

1 is a copy of the test report of the Korea Conformity Laboratories for the polyurethane foam of the present invention.

Hereinafter, a semi-incombustible polyurethane board and a manufacturing method thereof according to the present invention will be described in detail.

Unless otherwise defined herein, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms used in the description in the present invention are merely to effectively describe specific embodiments and are not intended to limit the present invention. In addition, the unit of additives not specifically described in the specification may be % by weight.

Also, the singular forms used in the specification and appended claims are intended to include the plural forms as well, unless the context dictates otherwise.

The present invention provides a semi-incombustible polyurethane board having excellent flame retardancy and heat insulation, significantly reducing the generation of harmful gases in the event of a fire, and having excellent strength and durability, and a manufacturing method thereof, compared to conventional polyurethane boards. do.

The present invention will be described in detail as follows.

The semi-incombustible polyurethane board according to one aspect of the present invention may be a semi-incombustible polyurethane board including a polyurethane foam layer and a surface layer laminated on one or both surfaces of the polyurethane foam layer.

In this case, the surface layer may include a heat insulating material layer, a glass fiber layer, and a metal thin film layer, and the heat insulating material layer may be coated and cured with a mixture containing a coating agent, water glass, expanded graphite, white lead, and silica.

Further, in the present invention, the mixed solution may further include a binder to improve adhesion and bonding strength between materials or layers.

Specifically, the mixed solution contains 10 to 20 parts by weight of water glass, 10 to 30 parts by weight of expanded graphite, 10 to 30 parts by weight of white lead, 10 to 30 parts by weight of silica, and 1 to 10 parts by weight of a binder, based on 100 parts by weight of the coating agent. Preferably, specifically, it is more preferable to include 15 to 20 parts by weight of water glass, 15 to 25 parts by weight of expanded graphite, 15 to 25 parts by weight of white lead, 10 to 20 parts by weight of silica, and 1 to 5 parts by weight of a binder. It is not limiting.

Provides a semi-incombustible polyurethane board that has excellent flame retardancy and heat insulation properties within the above range, can significantly reduce the generation of harmful gases in the event of a fire, and is easy to install, has excellent strength and excellent durability. can do.

In the present invention, the water glass may have a chemical formula of A ₂ O·nSiO ₂ and n may range from 1 to 3.9. At this time, A ₂ O means a compound of an alkali metal and oxygen, and A is preferably any one selected from lithium, sodium and potassium, and more preferably sodium among them, but is not necessarily limited thereto.

In the present invention, the expanded graphite may have a structural feature that layer separation occurs as graphite particles expand when heat is applied due to the layered structure of graphite. Due to these characteristics, expanded graphite can form an expanded carbonized layer upon ignition to perform flame retardant and heat insulation roles. Expanded graphite can be classified into several types according to the foaming ratio or the foaming initiation temperature, and is a semi-incombustible polyurethane board with excellent flame retardancy, waterproofness, and heat insulation, as well as being lightweight, easy to install, excellent in strength, and excellent in durability. If it can provide, the type is not limited.

For example, depending on the expansion ratio, single use of expanded graphite having an expansion ratio of 200 times, mixed use of expanded graphite having an expansion ratio between 200 and 300 times, or mixed use of expanded graphite having a expansion ratio of more than 200 times is possible. And, as another example, the use of expanded graphite in which foaming starts at 150 ° C to 200 ° C when the foaming ratio is 300 times or more depending on the foaming start temperature, and foaming starts at 200 ℃ to 250 ℃ when the foaming ratio is less than 300 times The use of 　 expanded graphite is possible, but this is only a non-limiting example and is not necessarily limited thereto.

In the present invention, the silica is preferably a closed type without pores on the surface, and has a diameter of 10 to 120 microns, an apparent specific gravity of 5 to 30 Kg/m ³ , or a true density of 125 to 600 Kg/m. It is more preferable to use ³ -phosphorus silica, but it is not necessarily limited thereto. When the silica is used, it is possible to provide a semi-incombustible polyurethane board having excellent flame retardancy, waterproofness, and heat insulation, as well as being lightweight, easy to install, excellent in strength, and excellent in durability.

In the present invention, the binder may be any one or mixtures thereof selected from acrylic, epoxy, urethane and silicone, and it is more preferable to use water-based acrylic in deriving the effect according to the present invention, but it is not necessarily limited thereto not. When the binder is used, it is possible to provide a semi-incombustible polyurethane board having excellent compatibility with water glass, excellent flame retardancy, waterproofness, and heat insulation, as well as being lightweight, easy to install, excellent in strength, and excellent in durability. there is.

In the present invention, the thickness of the glass fiber layer may be 5 mm or less, preferably 3 mm or less, more preferably 1 mm or less. Specifically, it may be 0.1 to 5 mm, preferably 0.1 to 3 mm, and more preferably 0.1 to 1 mm, but is not necessarily limited thereto.

In the present invention, the type of the metal thin film layer is not limited as long as it is adhered to one side or both sides of the polyurethane foam to preserve the physical properties of the polyurethane foam. At this time, using an aluminum foil layer is more preferable in deriving the effect according to the present invention, but this is only a non-limiting example and is not necessarily limited thereto.

In the present invention, the polyurethane foam layer may be prepared from polyurethane foam raw materials including polyester polyol, catalyst, foaming agent and polyisocyanate.

In addition, according to the present invention, the polyurethane foam raw material may further include a flame retardant and a surfactant.

At this time, the polyurethane foam raw material is 1 to 10 parts by weight of the catalyst, 30 to 40 parts by weight of the foaming agent, 10 to 30 parts by weight of the flame retardant, 1 to 10 parts by weight of the surfactant and the It may be a foam obtained by foaming a foaming composition containing 150 to 300 parts by weight of polyisocyanate and having an isocyanate index of 150 to 400.

Specifically, based on 100 parts by weight of the polyester polyol, 1 to 5 parts by weight of the catalyst, 35 to 40 parts by weight of the foaming agent, 15 to 20 parts by weight of the flame retardant, 1 to 5 parts by weight of the surfactant and 150 parts by weight of the polyisocyanate to 200 parts by weight, and it is more preferable that the isocyanate index is 150 to 400, but is not necessarily limited thereto.

At this time, the isocyanate index means that the actual amount of polyisocyanate used is divided by the theoretically required chemical amount of polyisocyanate required for the reaction of the polyol with active hydrogen in the reaction mixture, multiplied by 100. It can also be expressed as (Eq of NCO/Eq of active hydrogen) x 100.

In the present invention, the polyester polyol is selected from saturated or unsaturated aliphatic acids such as azelaic acid, dodecanoic acid, maleic acid, fumaric acid, itaconic acid, or ricinolic acid, and "?" acids such as phthalic acid, isophthalic acid, or terephthalic acid. It may be obtained by a polycondensation reaction of any one or a mixture thereof and a polyol, and in this case, using a terephthalic acid-based polyol is more preferable in deriving the effect according to the present invention, but is not necessarily limited thereto.

In the present invention, a known urethane catalyst may be used as the catalyst, and the type is not limited as long as it is a commercially available catalyst capable of deriving the effect according to the present invention. Specifically, it is any one selected from dimethylaminomethylphenol (2,4,6-Tris (dimethylaminomethyl)phenol), dimethyl cyclohexyl amine, and potassium octoate, or a mixture thereof. Although more preferable, it is not necessarily limited to this.

In the present invention, the foaming agent may be a known foaming agent, and the type is not limited as long as it can derive the effect according to the present invention with a commercially available foaming agent. Specifically, HCFC-141b, HFC-365mfc / 227, HFC-245fa, HFO-1234ze (E), HFO-1234ze (F), HFO1336mzz (Z) any selected from cyclo-pentane, n-pentane and iso-pentane It may be one or a mixture thereof, and it is more preferable to use HCFC-141b with water, but it is not necessarily limited thereto.

In the present invention, the known polyisocyanate may be used as the polyisocyanate, and the type is not limited as long as the effect according to the present invention can be derived from the commercially available polyisocyanate. Specifically, it may be any one selected from toluene diisocyanate (TDI), methylene diphenyl diisocyanate (MDI), hexamethylene diisocyanate, isophorone diisocyanate, and phenylene diisocyanate, or a mixture thereof, and methylene diphenyl diisocyanate It is more preferable to use (MDI), but it is not necessarily limited thereto.

In the present invention, the flame retardant is any one selected from TCPP (tris (chloropropyl) phosphate), TECP (tris (2-chloroethyl) phosphate), TEP (triethyl phosphate), TPP (tripropyl phosphate), DMMP (dimethyl methylphosphonate), etc. Or it may be a mixture thereof, and it is preferable to include TCPP (tris (chloropropyl) phosphate) and TEP (triethyl phosphate), and it is more preferable to further include a flame retardant for adhesive in deriving the effect according to the present invention, but this It is a non-limiting example and is not necessarily limited thereto.

In the present invention, a known surfactant may be used as the surfactant, and the type is not limited as long as the polyurethane foam raw material can be dispersed to the maximum. Specifically, it may be any one selected from anionic surfactants, nonionic surfactants, cationic surfactants, polymeric surfactants, and silicone surfactants, or a mixture thereof, preferably containing a silicone surfactant, and a hard Using a silicone surfactant is more preferable in deriving the effect according to the present invention, but this is a non-limiting example and is not necessarily limited thereto.

In addition, in the present invention, the polyurethane foam raw material may further include known additives that may be commonly included in foaming compositions such as cell stabilizers, flame retardants, chain extenders, epoxy resins, acrylic resins, fillers or pigments. Each of the additives may be independently used in an amount known in the art within the range of 0.01 to 40 parts by weight based on 100 parts by weight of the polyester polyol.

Specifically, the polyurethane foam raw material is any one selected from graphite, graphene, carbon nanotubes, fullerene, aluminum oxide hydrate, antimony trioxide, arsenic oxide, ammonium polyphosphate and calcium sulfate, or a mixture thereof, polyester polyol 100 It may be further included in an amount of 0.1 to 20 parts by weight relative to parts by weight, but is not necessarily limited thereto.

According to the present invention, after first premixing the remaining components other than the polyisocyanate among the polyurethane foam raw materials, the polyisocyanate may be mixed and foamed.

According to the present invention, a polyurethane foam raw material having the above-described composition and composition ratio is aged and cured to form a polyurethane foam layer, and a surface layer including the above-described heat insulating material layer, glass fiber layer, and metal thin film layer is laminated on one or both sides thereof to obtain The semi-incombustible polyurethane board has excellent flame retardancy and insulation properties, can significantly reduce the generation of harmful gases in the event of a fire, and at the same time has the advantages of being lightweight, easy to install, excellent strength, and excellent durability.

Therefore, the semi-incombustible polyurethane board according to the present invention has characteristics that can satisfy the performance of the semi-incombustible material in the gas hazard test (test method KS F 2271: 2016).

Another aspect of the present invention provides a method for manufacturing the semi-incombustible polyurethane board described above.

The present invention will be described in detail as follows.

In the method for manufacturing a semi-incombustible polyurethane board according to the present invention, a raw material introduced from a first roller is applied on a first conveyor belt to form a lower surface layer, and a raw material introduced from a second roller is applied on a second conveyor belt. to form an upper surface layer;

coating a polyurethane foam raw material between the upper surface layer and the lower surface layer by spraying; and

Forming a polyurethane foam layer by aging and curing the polyurethane foam raw material in a double conveyor room; can include

At this time, the thickness of the polyurethane foam layer can be adjusted by varying the distance between the lower surface layer and the upper surface layer, and the thickness may be 50 to 150 mm, preferably 60 to 120 mm, and more preferably 70 to 100 mm, It is not necessarily limited to this.

The present invention will be described in more detail based on the following Examples and Comparative Examples. However, the following Examples and Comparative Examples are only one example for explaining the present invention in more detail, and the present invention is not limited by the following Examples and Comparative Examples.

[Example 1]

A mixed solution was prepared by mixing 15 parts by weight of water glass, 20 parts by weight of expanded graphite, 20 parts by weight of white lead, and 15 parts by weight of silica with respect to 100 parts by weight of the coating agent, and then a glass fiber layer having a thickness of 1 mm and an upper part including an aluminum foil having a thickness of 1.5 mm. The mixed solution was applied on the face material and the lower face material using a first roller and a second roller and cured to form an upper surface layer and a lower surface layer. The viscosity of the mixed solution was maintained at 5,000 cps at 20° C. in consideration of coating workability, coating uniformity, and drying speed, and the coating amount of the mixed solution was maintained at 100 g/m ² in consideration of the coating thickness and the like. 1.1 parts by weight of water, 30 parts by weight of HCFC-141b, 1.5 parts by weight of dimethyl cyclohexyl amine, 2.0 parts by weight of potassium octoate, TCPP ( tris (chloropropyl) phosphate) 15 parts by weight, TEP (triethyl phosphate) 10 parts by weight, and silicone surfactant (B-8462, Evonik's silicone) 2 parts by weight were mixed at a stirring speed of 35 RPM at 30 ° C for 2 hours to obtain polyurethane foam raw materials were obtained. The polyurethane foam raw material was mixed with 180 parts by weight of methylene diphenyl diisocyanate (MDI) at a rate of 7000 RPM at 25 ° C. for 1 hour, sprayed between the upper surface layer and the lower surface layer, and then foamed to obtain polyurethane having a thickness of 70 mm A foam layer was formed. Accordingly, a polyurethane board laminated in the order of the lower surface layer, the polyurethane foam layer, and the upper surface layer was manufactured.

[Example 2]

In Example 1, a polyurethane board was manufactured in the same manner as in Example 1, except that the mixed solution further included 1 part by weight of a binder.

[Comparative Example 1]

In Example 1, a polyurethane board was manufactured in the same manner as in Example 1, except that the mixed solution was applied on the face material not including the glass fiber layer and the aluminum foil layer.

[Comparative Example 2]

In Example 1, a polyurethane board was manufactured in the same manner as in Example 1, except that the mixed solution did not contain white lead.

[Comparative Example 3]

In Example 1, a polyurethane board was manufactured in the same manner as in Example 1, except that the mixture did not contain silica.

[Comparative Example 4]

In Example 1, a polyurethane board was manufactured in the same manner as in Example 1, except that the mixture did not contain both white lead and silica.

For the polyurethane boards of Examples 1 to 2 and Comparative Examples 1 to 4, quasi-incombustibility was measured through a gas hazard test and shown in Table 1 below. In order to measure objective data, the test was requested to the Korea Conformity Laboratories.

The gas hazard test was conducted according to the K SF 2271:2016 method, and after putting laboratory mice in a predetermined enclosed space, injecting high-temperature gas of interior materials into the space, the time for the laboratory mice to stop their behavior was determined. checked.

Test Items Example 1 Example 2 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 gas toxicity test Mean time to stop 12 minutes 19 seconds 13 minutes 55 seconds 7 minutes 12 seconds 7 minutes 05 seconds 6 minutes 58 seconds 6 minutes 33 seconds Standard Deviation 76 seconds 38 seconds 23 seconds 15 seconds 18 seconds 23 seconds

As a result of the gas toxicity test on the polyurethane board according to Example 1, the average suspension time of mice was measured as 12 minutes and 19 seconds, and the standard deviation was confirmed to be 76 seconds, and in Example 2, the average suspension time was 13 minutes It was measured at 55 seconds, and the standard deviation was found to be 38 seconds. On the other hand, in the case of polyurethane boards by 1 to 4, the average suspension time was measured as 7 minutes 12 seconds, 7 minutes 05 seconds, 6 minutes 58 seconds, and 6 minutes 30 seconds, respectively, and the standard deviations were 23 seconds and 15 seconds, respectively. seconds, 18 seconds, and 23 seconds. This means that, in the case of the conventional polyurethane board, the average suspension time of mice is approximately 7 minutes, whereas the polyurethane board according to the present invention extends the average suspension time of mice to 12 minutes or more.

In fact, since the results of the gas toxicity test of the phenol foam board are generally known that the average suspension time of mice is 10 to 12 minutes, the polyurethane board according to the present invention shows excellent quasi-incombustibility at the level of the phenol foam board, Considering that there is a controversy about the harmfulness of foam boards to the human body, the semi-incombustible polyurethane board according to the present invention has relatively low harmfulness to the human body, excellent flame retardancy and insulation, and can significantly reduce the generation of harmful gases in the event of a fire. At the same time, it is lightweight, easy to install, has excellent strength, and has excellent durability.

As described above, the present invention has been described with specific details and limited examples, but this is only provided to help a more general understanding of the present invention, the present invention is not limited to the above examples, and the field to which the present invention belongs Those skilled in the art can make various modifications and variations from these descriptions.

Therefore, the spirit of the present invention should not be limited to the described embodiments, and it will be said that not only the claims to be described later, but also all modifications equivalent or equivalent to these claims belong to the scope of the present invention. .

Claims (16)

delete delete delete delete delete delete delete delete delete Applying the raw material introduced from the first roller onto the first conveyor belt to form a lower surface layer, and applying the raw material introduced from the second roller onto the second conveyor belt to form an upper surface layer;
coating a polyurethane foam raw material between the upper surface layer and the lower surface layer by spraying; and
Forming a polyurethane foam layer by aging and curing the polyurethane foam raw material in a double conveyor room; As a method for producing a semi-incombustible polyurethane board comprising a,
The surface layer includes a heat insulating material layer, a glass fiber layer, and a metal thin film layer, and the heat insulating material layer is a mixture of water glass, expanded graphite, white lead, silica, and a binder coated and cured,
The mixed solution includes 10 to 20 parts by weight of water glass, 10 to 30 parts by weight of expanded graphite, 10 to 30 parts by weight of white lead, 10 to 30 parts by weight of silica, and 1 to 10 parts by weight of a binder, based on 100 parts by weight of the coating agent.
The silica has no pores on the surface, has a diameter of 10 μm to 120 μm, an apparent specific gravity of 5 kg / m 3 to 30 kg / m 3, and a true specific gravity of 125 kg / m 3 to 600 kg / m 3, semi-incombustible poly Manufacturing method of urethane board. According to claim 10,
Method for producing a semi-incombustible polyurethane board having a thickness of the glass fiber layer of 0.1 to 5 mm. According to claim 10,
The metal thin film layer is a method for producing a semi-incombustible polyurethane board of an aluminum foil layer. According to claim 10,
The polyurethane foam layer is a method for producing a semi-incombustible polyurethane board formed by including polyester polyol, isocyanate, a blowing agent and a catalyst. 14. The method of claim 13, wherein the polyurethane foam layer is formed by further including a flame retardant and a surfactant. 14. The method of claim 13, wherein the polyester polyol is a terephthalic acid-based polyol. 15. The method of claim 14, wherein the polyurethane foam layer comprises 150 to 300 parts by weight of isocyanate, 30 to 40 parts by weight of a foaming agent, 1 to 10 parts by weight of a catalyst, 10 to 30 parts by weight of a flame retardant and 1 surfactant based on 100 parts by weight of polyester polyol. Method for producing a semi-incombustible polyurethane board that is formed by including to 5 parts by weight.

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